A medium shot from a side-angle view captures a lone mermaid floating vertically in the deep ocean, her head pointed downward and her body drifting weightlessly. She is a young woman with long, neutral-toned, very pale blue hair that flows upward toward the surface, mirroring the color of her iridescent fish tail. Her eyes are closed in a serene expression, and her slender hands are clasped together tightly in front of her chest. The surrounding environment is a vast, deep-sea abyss with distant coral reefs and floating plankton, creating a sense of immense scale and solitude. The lighting is dim and atmospheric, dominated by a cold color palette of deep indigos and frosty cyans, with faint rays of light filtering from far above. The overall mood is quiet and melancholic, characterized by a soft focus on the background and crystalline water textures.